Half to william marsh kasson



2 Sheets Sheet 1.

\No Model.) 7

W. R. FORBUSH.

FIRE PROOF FLOORING.

Patented Feb. 16,1892.

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was Nonms PEIERS cm, PHUTO-LITKD4,'WASHINGTDN, n. c.

UNITED STATES,

PAT NT OFFICE.

IVALTER R.'FORBUSI-I, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO \VILLIAM MARSH KASSON, OF SAME PLACE.

FIRE- PROOF FLOORING.

SPECIFICATION forming part of Letters Patent No. 469,082, dated February 16, 1892.

Application filed August 6, 1891. Serial No. 401,875. (No model.)

To all 1071 0121, it 12mg concern.-

Be it known that I, WALTER R. FORBUSH, a citizenof the United States, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Fire-Proof Flooring, of which the following, taken in connection with the accompanying drawings, is a specification.

This invention relates to improvements in fire-proof flooring, walls, or ceilings for build in'gs, bridges, &c.; and it has for its object to provide a very strong and comparatively light fire-resisting medium which can beeasily laid in a very simple manner and capable of sustaining very heavy loads or strains, as hereinafter described and claimed, reference being had to the accompanying drawings, where- 1n- Figure 1 represents a plan view of the floorsupporting beams and the metal bands secured to and supported from said beams. Fig. 2 represents a cross-section on the line X X, shown in Fig. 1. Fig. 3 represents a similar section showing the temporary staging in position below the beams for supporting the concrete or other plastic filling and cores during the process of making the flooring, showing also a tension device for imparting any desired tension to the metal bands. Fig. 4 represents a sectional view of the complete flooring, showing the temporary staging in position below it, same as in Fig. 3. Fig. 5 represents a cross-section on the line Y Y, shown in Fig. 4. Fig. 6 represents a plan view similar to Fig. 1, showing the cores in position between the metal bands. Fig. 7 represents a detail perspective view of one of the cores. Fig. 8 represents a detail perspec-. tive view of one of the clips or fastenings for securing the metal bands to the beams. Fig. 9 represents a cross-section of one of the beams, its metal band and clip or fastening device in locked position; and Fig. 10, a detail View of one of the tension devices for imparting a desired tension to the metal bands.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

usual, which may be made of wood or metal. In the drawings I have shown such beams as being made of metal of the well-known I-section; but they may be made of any other form, material, or c'onstructionwithout departing from the essence of my invention. The ends of said floor-beams are supported, as usual, in the walls of the building or otherwise, according to the nature of the structure for which the improved flooring is to be used. The said floor-beams are arranged at proper distances apart, according to'the load they. are to carry.

B B are the floor-supporting metal bands,

which are made preferably flattened in section--that is, thinner in' the direction of the weight of the load to be supported by them as compared with a direction at right angle theretoand this is done for the purpose of properly supporting the concrete or other plastic filling from such metal bands without liability of cutting or disintegrating such filling. Each of said metal bands may be made of any desired section, aslong as it is made thinner in the direction of the pressure of the load to be supported as compared with a direction at right angle thereto. Thus, for instance, fiattened metal bands of any desired section may be used, and I wish to state that I do not use nor claim the use of wire strands for this purpose, as the latter have not the sustaining property of metal flattened bands, owing to their liability of cutting and disintegrating the concrete or other filling that is used. The said metal bands B B are looped in catenary curves from beam to beam and secured to thelatter in any suitable manner, and this may be done preferably by means of U-shaped clips or fastenings 0. (Shown in detail in Figs. 8 and 9.) Each of such fastening devices is made of a flat soft-metal plate, somewhat wider than the floor-supporting band B,and has its ends 0 O bent downward at right angles, or nearly so, to the top portion, each such end piece O having a perforation 0, adapted to receive the metal band B, as shown. In using these fasteners they are strung upon the bands B before the latter are looped on the beams A, and after said bands are properly hung and adj usted the downwardly-projecting ends O of the fasteners'O are bent beneath lthe upper flanges of the beam A, as fully illustrated in Fig. 9. In hammering or bending the clasps in position on the beam and band shoulders Z) I) are formed on thelatter where it overlaps the edges of the beam,-as-shown in Fig. 9, causing the bandto be held still more firmly secured to the beam, thus preventing it from slipping by any movement on the beams when a strain is brought to bear on said bands. The said bands may be secured to the end beams in series; also, by means of said clasps orby wrapping or bending the band around the beam, as shown in the lefthand portion of Figs. 1, 2, and 3. After the bands B B have been thus placed in position and'secured at properdistances aparttO the said beams, place below the beams A a temporary platformfD, the top of which is'located about one inch below'the under side of the beams A A, as shown in Figs. 3, 4t, and 5. Said platform'may be temporarily erected andsupported'in any well knownmanner.

'When itis desired to'apply atension'to' the metal bandsB before embedding them in" the concrete plastic composition or otherfilling material, I'prefer to dothisfrom belowby means ofahooked screw'or tie bolt E, (shown in detail in Fig..10,) the upper end of which ishooked ontothe band Bmidway between any. two of thebeams A A, and the proper tension orstrain given to the band iBby means of. a nut E, that receivesthe screwthreaded shank of the hooked'tie bolt E,said nutbeingpreferably journaled in plank or beam E",placed below'thepl-atform D, as shown. 'I nowproceed as follows: Uponthe platform D,'I deposita layer'F of any of the such filling has had'time to set andharden Iplace upon it,between the bands BB, a series of preferably inverted- U shaped hollow cores G G, which are of uniform size and shape throughout their lengths.

metal netting, or other suitable metal reinforcing material 'g, as shown in'Fig. 7. Said cores are made to extend transversely from beam to beam between and unsupported by the bands B B, and in part above and in part below'the latter, as shown in Figs; 4 and 5. After saidhollow cores have been placed in position upon the plastic layer F, I fill the in- 'terstices between the hollow cores G G with a similar plastic or concrete fireresisting mass'IL'which, together with thelower plastic layer F, is then allowed to'set and harden,

causing the whole structure to be firmly Said cores may, if so desired, be reinforced by metal wire,

united together to and about the beams, band,- and cores. In practicelpr'efer to extend the upper filling l-I an inch or so above the up per portions of the beams A A, so as to entirely conceal and protect said beams when the flooring is completed. When the concreie orplastic'filling-F H is duly set and hardened, I remove the 'nuts'E and their bearing-planks E", after which the temporary platform D is also removed and the projecting ends of the tension screw-bolts E cut off; even with the under side of the flooring. By this arrangement I produce a very strong, durable, light, :and fire resisting flooring, which is cheaper and much more easily laid than others now in use.

By the employment of flattened metal supporting-bands, as described, the'plasterfilling is strongly and tenaciouslysupported thereon without danger of being cut, 'cracked,'or disintegrated, and thusthe very'best resultsare obtained. I

By the use of coresof preferablyuniform size throughout their lengthsthe cost of makingand laying'the same ismaterially lessened,and by (arranging said 'cores between the metalibands frombeam'to'beamand in such a, manner asto project in part above and part below said bands'I -am enabled to' unite, bind, and most firmly "secure together the componenfiparts of the flooring. Theihollow cores G lighten the weight of theflooring, and the plastic material above the cores distributes the superimposed lo'adand forms a surface to receive the finished floor, while the plastic material below the cores constitutesa base'to receive'the' finished ceiling. I

Having thus'fully described the'nature'and construction of my invention,l:wisl1'- to secure 'byLetters'Patent, and claim- 1."The combination, with the floor-beams, of metal bands supported on and suspended from said beams, a series of independenthollow cores arranged between each pair of'bands, and concrete or plasticfillinginwhichthe said beams, bands, and hollow cores are wholly embedded, substantially as and for'thepurpose set'forth.

2. The combination, with thefloor-beams, of metal bands supported on and secured to said beams, slotted metal fastening-clamps'arranged on said bands-,and concrete or plastic. filling in which said beams and bands areembedded, substantially as and for the purpose set forth.

3.The combination, with the floor-beams, of metalbands supported on and suspended from said beams, a series of independenthollow cores arranged between the bands,':the concrete or plastic filling in which the beams, bands, and cores are wholly embedded, and a platform arranged belowthe beamsgban'ds, and cores, and against whichthe concrete or plastic mass rests, substantially as described.

4:. The combination, with the floor-beams, of'the metal bands supported on and suspended from the beams,-a platform arranged in which the beams and bands are Wholly embedded, substantially as described.

5. The combination, with the floor-beams A, of the metal bands B, supported on and suspended from said beams, a series of independent hollow cores Gr, arranged between the bands, the concrete or plastic filling resting upon the platform, andin which the said beams, bands, and cores are wholly embedded, and adjustable tie-bolts E, extending through the platform and engaged with the metal bands between the floor-beams, substantially V as described.

6. The combination, with the floor-beams A, of the metal bands B, supported on and suspended from said beams, a platform D, arranged below the floor-beams, a concrete or plastic layer F, resting on the platform, a series of independent hollow cores G, arranged between the metal bands and resting on the concrete or plastic layer to extend in part above and in part below the metal bands, and a concrete or plastic filling H, covering the fioor-beams, the metal bands, and the cores, substantially as described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 1st day of August, A. D. 1891.

VVAL'PER R. FORBUSH.

Witnesses:

ALBAN ANDRIEN, WILLIAM M. KASSON. 7 

